Transformer schemes 2

[itsmoked]

I have three of these laying around:

I've have 208V 3ph and I need 460V 3ph.

I initially thought I'd use use the 0V and the 208V taps daisy-chaining each H3 to the next transformer's H4. Supply 208 to each H3 and use the three H1s for 460V but on closer examination that seems more likely to get me 600V H1-H1-H1.

Suggestions?

Keith Cress
kcress -

http://www.flaminsystems.com

 

[itsmoked]

Ha! Funny that you should ask! Yesterday about 6:30pm I wired up the machine, everything except the power cord which just needs the lugs screwed down. I bailed right at that point because the guy mentioned he'd not eaten since he'd gotten up at 7AM! I didn't want to further that situation. I'll go back today and actually power it up.

I was pleased to megger the Baldor 7.5HP motor and found it pegged my megger, both the motor and the blower and that, after sitting in a cold shop two blocks from the Pacific Ocean for a couple of years.

What I was most definitely NOT happy about was the this!
Look at this picture of the motor plate. Note the motor voltage rating for the actual motor? Now look at the orange circled part? That refers only to the blower. 460V.

As soon as I pull the cover off to wire the motor up... low-an-behold the damn thing has the same exact offerings as the motor. Very annoying. The entire transformer issue made moot. After all that effort I'm still going to try it. What ailed the Baldor numbskulls the day they created this plate?


Keith Cress
kcress -

http://www.flaminsystems.com

 

[waross]

Thanks for the update Keith.
Yours
Bill

Bill
--------------------
"Why not the best?"
Jimmy Carter

 

[HamburgerHelper]

Could someone explain what is significant about what is circled? I am missing the boat. [tt][/tt]

 

[itsmoked]

Sure.
The plate explains in excruciating detail how this INVERTER motor can be wired for 460 or 230, the currents, including even the Magnetizing current, the motor efficiency and the torque it produces, the Slip Frequency, even the MAXIMUM SPEED, but when it gets down to the blower motor it describes that the BLOWER is specifically 460V, 60HZ, .25 AMPS.

Controls were built to run the motor and the 460V blower. Because it was a 460V blower in a 208V realm the controller grew to twice the size, twice the weight, and took two thirds more engineering time. On installation it was discovered that the plate was BS and that the blower was actually 460/230 capable and to rub salt in the wound, even had all the leads pre-grouped for 230V operation! Very annoying, and a painful lesson that no matter how detailed the motor plate may appear you still can't trust it all.

Keith Cress
kcress -

http://www.flaminsystems.com

 

[wroggent]

Outside of a motor, what electrical components does this blower have? Or are there 2 motors in this system? Also confused.

 

[itsmoked]

Hi wroggent. This is a special inverter rated motor meaning it can supply full torque while not actually turning all day. To pull this off the motor comes with a separately powered blower. Note how the motor looks about twice as long as it's base foot? The entire left end is a 1/4hp blower. So yes, two motors - one device.

Keith Cress
kcress -

http://www.flaminsystems.com

 

[wroggent]

Ah, I see. I have not used or even seen a TEBC motor before. I was thinking the 7.5HP motor was being used to drive a blower. Thanks